摘要
MPEG编码视频帧间存在解码依赖性,导致VCR操作尤其是快进快退,需要服务端传送大量解码依赖帧.目前的VCR实现方法在解决这种依赖传输现象时,系统资源消耗与机顶盒解码复杂度非常高.本文提出一种基于GOP取帧与变帧率的VCR实现方法,基于GOP取帧消除依赖传输从而降低快进快退码率,可降到正常播的22%.变帧率实现码率可定制的效果,满足不同链路需求.该方法无需预处理视频,可作为在线算法应用于实时视频系统.
Due to the decoding dependency of MPEG coded frames,now existing methods on VCR implementation have to face the problem of how to settle the transmission of extra frames caused by this decoding dependency which would brought in heavy resource consumption and high STB decoding complexity. To tackle the problem, based on GOP （Group-of-Pictmes） fetch- ing and variable frame rate （VFR）,our VCRimplementation method called G-VFR is proposed. GOP based frame-fetching can effectively eliminate the dependency transmisson, and VFR leads to optional transmission rate. The experimentation results demonstrate that G-VFR can reduce the transmission rate of fast-scan operations to 22% of that of normal playback, and the VFR character can be achieved by parameter adjusting,meanwhile G-VFR can be used in real-time streaming system such as Time-Shifted TV.
出处
《电子学报》
EI
CAS
CSCD
北大核心
2009年第8期1675-1680,共6页
Acta Electronica Sinica
基金
国家863高技术研究发展计划(No.2008AA01A318)
安徽省高校自然科学研究项目(No.KJ2008A106)
关键词
快进快退
图像组
变帧率
机顶盒
MPEG视频
流媒体
VCR （Video cassette recorthing）
GOP （Group of Pictures）
variable flame rate
STB （ Set-Top Box）
MPEG video
streaming media
